Are you wanting feedback as to if you should send that email or if you should just make some changes?
My initial sense is that there is too much in there. It seems he has you backed you in a corner and you feel you need to explain yourself. You do not. As you stated, he is cold and cruel now, and so I am not sure he will even be able to hear your message. He is defensive and has his guard up.
You are understandably very fragile right now and I don't want him to use your vulnerability against you. I think right now less is more. I know you are feeling like you need to explain yourself, but I think since you are on the fence about what to say, then simply excuse yourself from the meeting. You are not available to meet then and that is it for now. Do not let him pressure you, intimidate you, or force you to rush into any decisions! Keep your chin up.
When you say that you need to discuss "deeper" issues first, what does that mean? It sounds as if you are needing to build trust and some sort of cordial R before settling on D, is that what you mean? If so, I completely understand how you feel. Unfortunately, people often have to come to settlements and agreements, even with all the stress and hard feelings lingering.
Hang in there! -Blu
“Forgiveness liberates the soul. It removes fear. That is why it is such a powerful weapon.” – Nelson Mandela